Machine for cutting gear-wheels.



No. 811,336. PATENTED JAN. 30, 1906.

` F. M. STAMBAUGH.

MACHINE FOR CUTTING GEAR WHEELS. APPLIOATION FILED man. 1905.

3 SHEETS-BHEET 1.

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No. 811,336. PATENTED JAN. 30, 1906.

E. M. STAMBAUGH.

MACHINE POR CUTTING GEAR WHEELS.

APPLICATION IILED MAR?, 1905.

3 SHEETS-SHEET 2.

No. 811,336. PATENTED JAN. 30, 1906. F. STAMBAUGH. MACHINE FOR UUTTING GEAR WHEELS.

APPLICATION FILED HAIL?, 1905.

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WYIIHY HUHHIHIIMIIIIIIIIIIIIIIIIIIIIIIIIIL UNITED sTATEs PATENT OFFICE.

FRANCIS M. STAMBAUGH, ST. LOUIS, MISSOURI, ASSIGNOR TO THF AMERICAN BRAKE COMPANY, OFpST. LOUIS.. MISSOURI, A CORPORA' TION OF MISSOURI.

MACHINE FOR CUTTING GEAR-WHEYELS..

No. s1 1,336.

VSpeccaton of Letters Patent.

Application iiled March 7,1905. Serial No. 248,848.

Patented Jan. so', 1906.

To all. whom it may concern.:

Beit known that I, FRANCIS M. STAMBAUGH, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Machines for Cutting GearfWheels, of which the following is'a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying draw-v ings, forming part of this specification, in

which- A Figure 1 is a side elevational view of my improvedmachine.- lFig. 2 is a fronti elevationalv view, partly in section. Fig. 3 is a top plan view of the cap-plate or cutter-guide. Fig. 4 is a top plan view of the blade-carrying cutter-head. Fig. 5 is a side elevational view of the cutter-head. Fig. 6 is a detail view,fore

shortened, of the cutter-head guide and nut? pedestal.

Fig.- 7 is a horizontal sectional view showing the powerl transmission. Figs. 8, 9,' and 10 are detail views of the clutch-shifting mechanism. Fig. 11 is a fragmentaryview of a portion of the blade-carrying cylinder, one of the blades being detached. Fi 12 is a portion of the cap-pieceand one o the sliding blocks cooperating therewith. Fig. 13 is a side elevational view of a finished wheel made upon my improved machine, and Fig. 14 is a top plan view ofthe same.

This invention relates to a new and useful improvement in machines for cutting gearwheels, the object being to synchronously cut all of the teeth at one operation.

The special use to which the machine illustrated in the drawings is applicable is the cutting of ratchet-teeth from slack-adjuster blanks, such as is Ashown in Figs. 13 -and 14, which ratchet-teeth, together with their connected hobs, are em loyed as component parts of a slack-a juster mechanism for `railway rolling-stock. It is obvious, however, that depending upon the nature of the gear-wheel or ratchet-wheel to be formed the teeth of the cutting-blade may be shaped to the desired form, and attention is also directed to the fact .that while I have shown' these cutting-blades as being tangentially disposed it is obvious that' they may be ra- In the form of machine .illustratedin the cured together by suitable fastening devices. l

The numeral 3 indicates a cap-piece mounted on the standards, which cap-piece is illus# trated in Fig.- 3 as being provided with tangential slots 4, in" which operate cuttingblades 5. As' heretofore'stated, under certain conditions the slot-s may be radially disposed in the cap-piece, and I therefore do not limit myself to thetangential arrangement. In line with the slots 4 in the cap-piece are lugs 6, arranged near the periphery thereof and having threaded openings for the passage of adjusting-screws 7. These adjustingscrews coperate with sliding'blocks 8, `arranged in the bottoms of slots 4, said sliding blocks carrying at their inner ends rollers 9, which rollers provide antifriction devices for the outer ed es of the cutting-blades 5J In the walls oft e respective slots 4 are grooves 4a, which receive the lugs 8, projecting from the sides of the blocks 8, so that a guide is formed for each block 8 and the upward displacement of any of said blocks is prevented. The lower edges of the cutting-blades are so formed that when the cutter-head 1 0, to which they are pivotally connected, is in its upper position, as shown in Fig. 2, the cutting-blades fold outwardly, as shown in dotted lines,- so as 10, which head is s otted tangentially,l (or ral dially, as the case may be,) as shown inFig. 4. Each blade is provided with a rounded perforate lower end designed to iit in the slots in the cutter-head, suitable means being provided to secure the pivots o f said blade in position. Said pivots are deslgnated by the numeral 5a and are shown in Figs. 5 and 11 as being received in lateral ways 10, whose outer ends may be opened to permit the insertion and removal of the pivots. After the pivots are in place blocks 10b are inserted and held in place by screws 10".

11 indicates a post mounted in Athe base and forming a guide for the cutter-head 10. This post is provided with a threaded stud on its upper end, upon which the blanks 12, as Shown in Figs. 13 and 14, are mounted to be operated upon. The blank is of course un- IOO cut when originally placed in position, as shown in Fig. 2, and as the cutter-head and its carried blades descend the teeth on the blades form the teeth of the gear.

Referring to Figs. 1 to 7, it will be seen that the cutter-head is provided with racks upon opposite sides thereof, with which racks mesh pinions 13. Pinions 18 are mounted upon suitable shafts journaled in the side frames 2, said shafts carrying at one end meshing gears 14, the opposite end of one of said shafts having mounted thereon a driving-gear 15, meshing with a pinion 16. Pinion 16 is mounted on a shaft 17, journaled in the side frames, which shaft has a doublefaced clutch 18 splined to and slidingly mounted thereon. are pulleys 19 and 20, said pulleys being loosely mounted on the shaft and provided with clutch-faces for cooperating with the clutch 18. These pulleys are driven in opposite directions by appropriate belts and in addition are of different sizes, the smaller running at a relatively high speed and being effective to drive the machine in lifting the cutter-head 10, While the larger, being operated at a relatively low speed, is effective ,to move the cutter-head and its connected blades outwardly While the Work is being done.

Clutch 18 (see Fig. 2) is provided with an annular groove, in which enter projections from the forked end of a lever 21. Lever 21 1s mounted on a rock-shaft 22, journaled in suitable brackets extending from one of the side frames and upon which rock-shaft is arranged a ieXible operating lever or handle 23. This handle 23 cooperates with a stoplug 24, rigid on one of the side frames, and when said lever is in its position under said lug the clutch 18 is out of engagement with the pulleys 19 and 20. However, when said lever 1s sprung from under the lug 24 and hfted the clutch 18 is thrown into engagement with the large pulley 20, and through the gearing above described the cutter-head 1() and its connected cutting -blades are caused to descend.

25 indicates an arm on the rock-shaft 22, Whose end 1s in the path of projections on the cutter-head 10. When the cutter-head 10 descends, the head thereof strikes the arm 25 and operates the rock-shaft 22, so as to depress the lever 23 and move the clutch 18 out of engagement with the pulley 20. l This is shown 1n Flg. 10. Rock-shaft 22 is also rovided with an arm 26, having an inclined ace on its end cooperating with a s ring-pressed roller 27, mounted in a suitab e housing on one of the side frames. As the upper end of the cutter-head 10 engages the arm 25 and compresses the same so as todisengage the clutch from the large pulley 20 the inclined portlon of arm 26 is brought opposite the sprung-pressed roller 27 and said springpressed roller acting upon said inclined .face

On each side of clutch 18 effects a further downward movement ofthe arm 26, and consequently a continued rocking movement of the shaft 22 and its connected parts. Clutch 18 is thus thrown into engagement with the small pulley 19, which, as before stated, is reversely rotated, and through the gearing heretofore described the cutterhead 1() and its connected parts will be elevated. As the head 1() ascends a lug 28 (see Fig. 8) will engage the arm 25 and rock the shaft 22, so as to place the clutch in a neutral position out of engagement with the small pulley 19. In this position of the parts the inclined end of arm 26 is out of engagement with the spring-pressed roller, and the lever or operating-handle 23 is brought up against the lug 24, 'which arrests the same and provides a stop for the parts in the neutral position of the clutch. In this position, as before stated, the blades 5 are folded back,

enabling access to be had to the finished wheel and the introduction of a new blank on the upper end of post 11. To accommodate the blank so positioned, the lever 23 is disengaged from the stop 24 and lifted, as shown in Fig. 9, to throw the clutch into engagement with the large pulley 20, when the operations before described will be performed.

Referring to Fig. 2, it will be seen that the blades 5 are wider at the top than at the bottom. This construction of the blades insures the feed or bite of the successive teeth as they are brought .into contact with the blank being cut. This arrangement also permits the outer straight edges of the blades to be parallel and insures a permanent adjustment of the rollers 9 without the intervention of the movingparts to cause the successive teeth to bite into the metal of the blank as the blades descend.

I am aware that minor changes in the construction, arrangement, and combination of the several parts of my device can be made and substituted for those herein shown and described without in the least departing from the nature and principle of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a machine of the class described, the combination with a base, of a cap-piece above the base provided with slots diverging from the center and having a central opening, a cutter-head alining with the opening, a plurality' of teeth-cutting blades pivotally connected to said cutter-head and arranged in circular series thereon, said blades being guided in the slots in the cap-piece, and the pivots of said bladesbeing above the cap-piece when the cutter-head is at the end of its upward stroke thereby enabling said blades to move out of a vertical plane, and means for actuating the cutter-head to move the blades into a vertical plane for cutting the teeth; substantially as described.

IOO

IIO

IIS

2l In a machine of the class described, theV combination with a base, of a cap-piece above the base provided with slots diver ing from the center and having a central diening, a cutter-head alining with the opening, a' plurality of teeth-cutting blades pivotally connected to said cutter-head and arrangedin circular series thereon, said blades being guided in the slots in the cap-piece,land the pivots of said blades being piece when the cutter-head 1s at the end of its upward stroke thereby enabling said blades to move. out` of a ver-tical plane, and means for actuating the cutter-head to move the blades into la vertical plane for cutting the teeth, and Jfor imparting a vertical reciprocatory movementv to said blades When acting upon the material t-be cut substantially as described.

vcombination with a Jframe havin 3. In a machine ofthe class described, the combination with a base, of a cap-piece above the base provided with slots dlverging'from the center and having a central opening, a' cutter-head alinin'g with the opening, a plu-' rality of teeth-cutting blades pivotally connected to said cutter-head and arranged in circular series thereon, said blades being guided in the slotsin the cap-piece, and the piv` ots of said blades being above the cap-plece when the cutter-head is at the end of its upward 'stroke thereby enabling said blades to move out of a vertical plane, meansfor actuating the cutter-head to movey the blades into-a vertical plane for cutting the teeth,

and a work-holding y.device concentric with' the cutter-head; substantially as described. 4. In amachine of the class described, the a central opening, a work-holder alining wit the opening, a series of blades arranged around the opening/guiding means for said blades, and a yreciprocatory actuating device concentric withthe opening and havin said blades pivotally connected thereto, tlgie pivots of said blades being normally above said guiding means to enable said blades to lie in an apc. proXimately horizontal plane, said device being capable of moving the blades to a vertical plane and thence transversely across the material to be cut substantially as described.

5. In a machine of the class described', a

, frame, `a cap-piece mounted on said frame above the cap- Ward stroke of the cutter-head to hold said blades in a vertical position; substantially as described.

6. In a machine ofthe class described, a frame, a cap-piece mounted on said frame and provided with a central opening, a plurality ofslots formed in said cappiece and diverging from said central openingtoward the periphery of the cap-piece, a reciprocating cutter-head alinin with the central opening and having aplura ity of teeth-cutting blades pivotally connected thereto, said blades being guided'in the slots in the cap-piece and the pivots of said blades being above the capvpiece when the cutter-head is at the end of its upward stroke thereby enabling said blades to move out of avertical position, and adjustable`blocks bearing against said'blades during the downward stroke of the cutter-head to hold said blades in a vertical position; substantially as described.

i 7. In a machine of the class described, 'a frame, a cap-piece mounted on said 'frame and provided with a central opening, a plurality of slots formed in said cap-piece and. diverging from said central opening toward the periphery of the cap-piece, a reciprocatingcutter-head alining with the central opening and having a plurality of teeth-cutting blades pivotally connected thereto, said blades being guided` in the slots in the cappiece and the pivots of said blades being above the cap-piece .when the cutter-head is at the end of its upward stroke thereby enabling said blades to move out of a vertical position, and blocks adjustably mounted in the side walls of said slots and provided with rollers which bear against the` outer edges of said blades during the downward stroke of the cutter-head to hold said blades in a verti- .cal position substantially as described.

8. In a machine of the class described, the combinationwith a Work-holder, of a cutterhead surrounding said Work-holder and having a head provided with peripherallyarranged slots forming upstandingv projections,

grooves in the upstanding projections, a series of blades arranged in circular series and having trunnions at their lower ends journaled in the Grooves in said projections, 4removable bloc s for closing the ends ofthe IOO IIO

grooves, meansfor holding said blocks in po- 4 sition, and means for reciprocating the cutterhead; substantially as described.

9. In a machine of the class described, the combination with awork-holder comprising a post having a work-engaging end, a reciprocatory cutter-head surrounding said work-' holder and having slots in one end, pivoted teeth-cutting blades carried in said slots, a cap-piece surrounding the blades and cutterhead and having guide-grooves, and bladepressing adjustable blocksworking in the guide-grooves in the cap-piece; substantially as described.

i0. In machine of the class described, the In testimony whereof I hereunto aHiX my combination With a Work-hohling post, a eutsignature, in the presence of two Witnesses, terhead surrounding said post, outtingthis 3d day of Maieh, 1905.

blades piVotaIIy carried by said Cutter-head, FRANCS M STAMBAUGH a csp-piece having an opening of greater diameter than the diameter of the cutter-head, Witnesses:

and slidable blade-pressing blocks carried by EDWARD WILSON .l

said cap-piece; substantialrly as described. l GEORGE BAKEWELL. 

